<script setup>
// import { createApp ,ref } from 'vue'
// import { ref } from 'vue'
import { ref, onMounted } from 'vue'

defineProps({
  msg: {
    type: String,
    required: true
  }
})

// createApp({
//   setup() {
//     return {
//       count: ref(0)
//     }
//   }
// }).mount('#app')

// 响应式状态
const count = ref(0)

// 用来修改状态、触发更新的函数
function increment() {
  count.value++
}

// 生命周期钩子
onMounted(() => {
  console.log(`The initial count is ${count.value}.`);
})



</script>

<template>
  <h2>{{ name }}</h2>
  <input v-model="name" type="text">
  <dev id="app">
    <button @click="increment">
      Count is: {{ count }}
    </button>
  </dev>
  <div class="greetings">
    <h1 class="green">{{ msg }}</h1>
    <h3>
      You’ve successfully created a project with
      <a href="https://vitejs.dev/" target="_blank" rel="noopener">Vite</a> +
      <a href="https://vuejs.org/" target="_blank" rel="noopener">Vue 3</a>.
    </h3>
  </div>
</template>

<style scoped>
h1 {
  font-weight: 500;
  font-size: 2.6rem;
  position: relative;
  top: -10px;
}

h3 {
  font-size: 1.2rem;
}

.greetings h1,
.greetings h3 {
  text-align: center;
}

@media (min-width: 1024px) {

  .greetings h1,
  .greetings h3 {
    text-align: left;
  }
}
</style>
